| Electronics > Repair |
| Advantest R6246 "Repair" and Teardown |
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| dietert1:
If response handshaking does not work properly, you could try to insert "Sleep(100)" between the command asking for data and reading the response. In case it works, you can try and reduce the delay. Anyway it's not about the response time of the meter but about threads to run. Regards, Dieter |
| 42Khz:
--- Quote from: dietert1 on December 26, 2021, 04:16:06 pm ---If response handshaking does not work properly, you could try to insert "Sleep(100)" between the command asking for data and reading the response. In case it works, you can try and reduce the delay. Anyway it's not about the response time of the meter but about threads to run. Regards, Dieter --- End quote --- Hi Dieter, Thanks for your suggestion, I gave it a try. Unfortunately the instrument is still very eager to tell me its name and EEPROM versions, but not much more. I changed the delay up a bit but still no dice. To confirm that I can both write to the R6246, and read data from other instruments (in this case the HP3456A), I wrote a little test script. It sweeps the SMU output voltage from -62V to 62V in 1V increments, making the HP3456A measure the output after each step. The attached plot shows the difference between the value reported by the HP3456A and the value sent to the R6246 in mV. For a more serious measurement I would of course use a second DMM, this is just a demonstration. |
| dietert1:
The sequence in the GPIB example of the calibration manual translated by leighcorrigall looks like this ... 1360 PRINT @R6245A;"XE 1" 1370 INPUT WAIT 1, “”, A$ 1380 INPUT @R6245A; B$ ... Don't know why there are two input statements. In that example the DV command is also followed by a INPUT WAIT 10, “”, A$ There is a table with explanations, e.g. line 200 "FMT..." to set the format on the 6245. And "input wait.." appears to be a delay. Regards, Dieter |
| 42Khz:
--- Quote from: dietert1 on December 26, 2021, 07:40:06 pm ---The sequence in the GPIB example of the calibration manual translated by leighcorrigall looks like this ... 1360 PRINT @R6245A;"XE 1" 1370 INPUT WAIT 1, “”, A$ 1380 INPUT @R6245A; B$ ... Don't know why there are two input statements. In that example the DV command is also followed by a INPUT WAIT 10, “”, A$ There is a table with explanations, e.g. line 200 "FMT..." to set the format on the 6245. And "input wait.." appears to be a delay. Regards, Dieter --- End quote --- Thank you very much for pointing me in the direction of that manual: adding a delimiter format command solved the issue! Attached is a quickly produced IV curve of a yellow LED measured using channel A. The current limit is set to 10mA, as can be seen. |
| wichers:
Bought a late ADCMT R6246 as well, it was rough on the outside but the inside is in pristine condition. All it needed was a new power button. For those interested, I dumped the motherboard firmware. |
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